PEG-60 Hydrogenated Castor Oil functions as a highly effective non-ionic solubilizer and emulsifier that allows oil-based components to disperse seamlessly into water-based formulas. This versatile ingredient enhances formula clarity and stability, making it a staple in clear toners, serums, and body washes.
- INCI Name:
- PEG-60 Hydrogenated Castor Oil
- Chemical/Scientific Name:
- Polyethylene glycol (60) hydrogenated castor oil
- Common Aliases:
- Hydrogenated Castor Oil Ethoxylate, Polyoxyethylene (60) Hydrogenated Castor Oil
| Category: | Surface-Active Substances |
| Source Origin: | Synthetic and Vegetable-derived |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Pharmaceuticals, Industrial |
| Solubility: | Water |
At a Glance: Properties & Effects
| Solubilization Efficacy | |
| Formula Stability | |
| Texture Enhancement | |
| Irritation Risk |
- Primary Benefits:
- Enables the creation of transparent, oil-in-water formulations without separation.
- Effectively dissolves Fragrance oils and essential oils into Aqua solutions.
- Provides a mild emollient feel, reducing the potential tackiness of high-performance actives.
- Supports the long-term shelf life of complex emulsions by preventing phase inversion.
- Potential Risks:
- Minimal risk of irritation, though highly sensitized individuals should perform a patch test.
- Potential presence of trace impurities (1,4-dioxane) if not properly purified during manufacturing.
Biological Action & Cosmetic Profile
The chemical structure of PEG-60 Hydrogenated Castor Oil consists of a hydrophobic core derived from Ricinus Communis Seed Oil and a hydrophilic shell formed by 60 units of ethylene oxide. This high degree of ethoxylation gives the molecule a high Hydrophile-Lipophile Balance (HLB) value, typically around 14 to 15. Because of this balance, the ingredient excel at creating micelles that encapsulate lipid-soluble molecules, effectively “hiding” them within a water-based environment.
Dermal application of this ethoxylated surfactant does not typically result in deep penetration of the stratum corneum. Instead, it remains on the surface or within the upper layers of the skin, where it can exert a slight softening effect. Formulators favor this specific PEG count because it offers superior clarity in aqueous solutions compared to PEG-40, ensuring that toners and micellar waters remain visually transparent even when containing fat-soluble vitamins like Tocopherol.
Surface tension reduction is another critical function of this compound. By lowering the interfacial tension between the skin and the product, it improves the “spreadability” of the cosmetic, ensuring an even distribution of active ingredients. While it is a surfactant, its large molecular size makes it significantly gentler than traditional cleansing agents like sodium lauryl sulfate, making it suitable for leave-on products designed for sensitive skin.
Broader Applications & Origins
The manufacturing process begins with the hydrogenation of Ricinus Communis Seed Oil to produce a more stable, saturated fat. This hydrogenated oil is then reacted with ethylene oxide in a process called ethoxylation. While the raw material is plant-based, the final ingredient is considered a synthetic derivative due to this chemical modification. This hybrid nature allows the ingredient to bridge the gap between natural emolliency and synthetic performance.
Beyond skincare, this ingredient is widely utilized in the pharmaceutical industry to improve the bioavailability of poorly water-soluble drugs. In personal care, it is ubiquitous in hair styling gels, shaving creams, and oral care products. Its ability to remain stable across a wide pH range makes it a reliable choice for products containing Citric Acid or Sodium Hydroxide used for pH adjustment.
Routine Integration
- Synergies:
- Oil-soluble vitamins, such as Tocopheryl Acetate or retinyl-palmitate, are easily stabilized by this solubilizer.
- Humectants like Glycerin and Panthenol work well alongside it to provide a balanced moisture profile.
- It pairs effectively with Phenoxyethanol and other preservatives to ensure they are evenly dispersed throughout a formula.
- Conflicts:
- Extremely high concentrations of electrolytes may occasionally destabilize the micelles formed by non-ionic surfactants, though this is rare in standard cosmetic use.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated PEG hydrogenated castor oils multiple times, concluding that they are safe for use in cosmetics at concentrations up to 100%. Clinical studies indicate that PEG-60 Hydrogenated Castor Oil is non-sensitizing and non-irritating at standard formulation levels, which typically range from 0.5% to 5.0%. Modern manufacturing protocols, such as vacuum stripping, are employed to ensure that residual ethylene oxide and 1,4-dioxane remain well below safety thresholds defined by the SCCS and FDA, mitigating concerns regarding carcinogenic contaminants.
Is PEG-60 Hydrogenated Castor Oil safe for acne-prone skin?
Yes, this ingredient has a comedogenic rating of 0, meaning it is highly unlikely to clog pores or exacerbate acne. It is frequently used in oil-free or lightweight gel formulations for this reason.
Why is it used in “alcohol-free” products?
Traditionally, alcohol was used to dissolve oils and Parfum into water. PEG-60 Hydrogenated Castor Oil allows formulators to achieve the same result without using Alcohol Denat, which can be drying or irritating to the skin barrier.
Is this ingredient “clean” or “natural”?
While derived from castor seeds, the ethoxylation process means it is not classified as a “natural” ingredient by organizations like COSMOS. However, it is widely accepted as safe and effective by global regulatory bodies.